Adding Adaptive/Smart Cruise Control to SEL model

Yea! I found out you will need a headlight wiring harness + sensor+ switch. There are many store have them , or you can borrow some 1 with Ultimate trim VIN. Are you sure the new harness will fit the old connector? I would try the switch first, and check if the switch work for the screen? Can we rent a kona ev ultimate somewhere?

 

You can google the scc sensor and it will come up with many store that carry it. I dontt think all of them require the VIN.

 

I believe OpenPilot also requires the same sensors.. you can't have OpenPilot without installing adaptive cruise control.

 

The “Find my Car” app is a free alternative that I found works OK...

 

And here's me naively thinking you were making some sort of joke. Ralph Nader would turn in his grave...

 

As Toyota's CEO said this week, Musk knows how to make money (from starry-eyed investors), but Toyota knows how to make cars.
My last all-day outing was to a national agricultural machinery expo, which took up a decent chunk of a large farm. The 40,000+ daily visitors parked in huge fields notable for mown grass, no markings, and precious little signage. At the end of the day, walking a couple of miles back to the car was a given, and without the "find my car" app I would still be there. All the fancy tech in the Tesla world would have been absolutely useless.
As long as I remain fit enough to walk 10 miles, a couple more is neither here or there...

 

I think you are a little over optimistic about about Tesla's summon feature capabilities. Its max range is 200 ft and the car has to be within line of sight as you have to monitor the car. Several reports of model 3s with bumper damage because owner didn't carefully monitor and put blind faith in its capabilities. You can only get the feature with the 8 thousand dollar full self driving upgrade. Honestly at this point the summon feature seems like an expensive parlor trick with very limited actual functional usefulness.

 

You'd need at the very least the radar assembly [99110-K4000, $470], three flange nuts [13396-06007-K, $2], the steering wheel switch assembly [96720-K4130-TMT, $74], the front bumper wiring loom [91840-K4030, $370], and the front bumper that has the cutout/cover for the radar assembly [86512-K4000, $177]. There is also a different part number for the engine bay wiring loom [91208-K4590, $2258] so I think you might be right that the new front bumper harness probably won't fit into the main harness unless you swap that out as well, and you might end up having to replace more of the steering wheel subassembly than just the buttons since the radar equipped cars normally come with the heated wheel though it might work as-is. Heck you might not even need to replace the button in the wheel as long as you don't mind it saying "OK" instead of having the smart cruise control icon, who knows?

Easiest way to find out like you said would be to find an Ultimate model and check the differences, but I think you're looking at $3,500 in new OEM parts to make the front radar work. This could be cheaper if you had access to a salvage and could pilfer the parts, but $3,500 for something that might work and involves disassembling the whole front end, swapping the headlights, the temperature sensor, every wiring harness in the front of the car, and taking apart the steering wheel where the explosive air bag detonator lives doesn't sound like a great deal or a fun time to me.

 

So I took one for the team here, got (some of) the parts and tried it out...and it's a bust. The wiring harness *does* connect fine (at least physically), and I got the radar assembly connected to the harness. Unfortunately, when I started the car up, the SCC Reaction settings were not present under Settings > Drive Assistance (Per page 5-104 in the 2019 US manual). Resetting the system settings as whole and disconnecting/reconnecting the 12V battery to force-reboot things didn't work either. I'm basically using the presence/absence of that setting as a proxy for whether or not the equipment is detected and working.

Getting to the wiring harness requires that you remove the whole front bumper. Doing that was fairly easy once I got the confidence - after removing the various pegs and screws, you basically have to pull significantly harder than feels safe; if you've ever opened an old-style Mac mini with a putty knife, it's a lot like that. https://static.nhtsa.gov/odi/tsbs/2020/MC-10172139-0001.pdf provides good instructions for how to get it removed, including demonstrating good grip positions.

Once the bumper is off, it's easy to get to the relevant wiring harness. My 2019 SEL (US model) has the mounting bolts for the radar unit, and the wiring harness itself appears identical to the stock one just with the addition of the plug for the radar unit. It's rather unfortunate that it doesn't appear to work, but I'll hold on to the parts if anybody *does* figure out what else is necessary.

 

I still find it curious that the parts catalog lists two separate main wiring harnesses for the engine bay - one for front radar and one without. My suspicion is that both use the same plug (between the main harness and the front bumper harness) but the main harness is missing the additional cables that would connect up to the radar unit plug.

Since you have both the original front bumper harness and the radar-enabled one, maybe you could compare the two plugs and see which additional pins/wires are included on the main harness connector, and then see if your main harness has corresponding wires or not? The whole main harness is really expensive but at least then you'd know one way or another.

 

Interesting, did you find a report from somebody that had personally used that tool for this purpose? The service manual seemed to allude to something along these lines, so perhaps an independent shop could twiddle the necessary bits as well. (It also mentioned a calibration procedure - have you heard if/to what extent that's necessary?)

 

Here's an English version of the device page that looks like you can buy in USD:

https://canhacker.com/product/ch-obd-m02-can-coder/

 

Thanks for trying! Have you install the steering wheel switch?